http://www.theecologist.org/blogs_and_comments/commentators/2638887/want_to_double_world_food_production_return_the_land_to_small_farmers.html
Sowing and harvesting together
http://www.theecologist.org/blogs_and_comments/commentators/2638887/want_to_double_world_food_production_return_the_land_to_small_farmers.html